Curve-scriber.



C. F. ODIN.

CURVE SCRIBER.

APPLICATION-FILED JULY 3. m4.

Patented Jan. 18, 1916.

UNITED. STATES PATENT OFFICE.

CHARLES E. ODIN, OF-ELIIIBA, NEW YORK, ASSIGNOB OF ONE-HALF TO JAMES R.

SPILLAN, OI ELMIRA, NEW YORK.

GURVE-SCRIBER.

Specification of Letters Patent.

Patented Jan. 18, 1916.

Application filed July 3, 1914. Serial No. 848,820.

vision of a simple device for drawing ovals which is of strong andsimple constructlon,

accurate of operation and which is comparatively inexpensive tomanufacture.

The novel features of the invention will be apparent from the followingdescription taken in connection with the accompanying drawings, inwhich,

Figure 1 is a side elevation of a compass embodying my invention; Fig. 2is an elevation 'of the right hand side of Fig. 1; Fig. 3 is atransverse section on the line 33 of Fig. 1; Fig. 4 is a transversesection on the line 44 of Fig. 1; and Fig. 5 is a side elevation on areduced scale and showing the parts in different position from that inFig. 1. 7

Referring to the drawings, 10 indicates a non-revoluble leg having thetwo Points 11 and 12 at its lower end, these points being adapted toengage the paper to hold the leg.

At the upper end of the leg 10 is a cap 13 having a handle 14 and aswivel connection with the leg, the latter being provided by means of agroove in the leg and a pin 16 carried by the cap 13 and engaging theroove, as shown in Fig. 4. On the side of t e cap 13 is a pair of spacedlugs 17 to which the upper member 18 of the other leg is pivoted. A link19 is pivoted to the lower end of the member 18 and has pivoted at itslower end a member 20 onwhich is slidably arranged the tubular member 21carrying the pencil point 22. A spring 23 is arranged in the member 21and bears .against the end of the member'20, pressing the pencil 22against the paper. The members- 20 and 21 are held together by means ofa pin 24 carried by the member 20 and slidably arranged in a slot 25 inthe member 21. v

The leg 10 has pivoted thereto by means of the screw 26 a guiding member27 having a circular outline 28 and a semi-circular cross section, asindicated at 29 in Fig. 2.

A spring 30 secured in a recess'31 in the member 18 and connected withthe cap 1-3 holds the member 18 in engagement with the member 27 so thatas the leg formed by the members 18, 19, 20 and 21 revolves about theleg 10, it is guided by the member 27. The member 27 is held in anydesired position on its axis by means of a clamping nut- 32, whichengages the screw 26 and clamps the member 27 to the leg 10. Byloosening the nut 32 the member 27 may be swung about its pivotalconnection with the leg 10 above or below the position shown in Fig. 1and it will be evident that when the member 27 is either above or belowthe position shown in Fig. 1 the point 22 will describe an oval .whenrevolved about the leg 10. If it is desired to describe a complete ovalthis may be done by first describing one half and then turning the leg10 around 180 and describing the other half. Similar ovals of differentsizes may be described by adjusting the members 19 and 20 with respectto the member 18 and referring to Fig. 5 it will be seenthat the partsare in position to describe a much larger oval than when in the positionshown in Fig. 1. By having the outer surface of the member 27 rounded orsemi-circular in vertical cross-section, the member 18- will have asmooth and uniform surface to slide on and the oval described will be.regular and accurate. It will be seen that by interposing the pivotallink 19 between the members 18, 20, of the encil leg of the compass, thepencil holder is enfixed length, atelescopic two-jointed leg pivholdingsaid revoluble leg against said 10 oted theretoland adapted to. berevolved member.

fhBIBaIOIIDd, a. semi-circular giliding mem- In. testimony whereof {I mysignature 'ber pivoted to said non-revolving leg on an in presence oftwo witnesses. axis ,extendmg transversely thereof and. havi CHARLES vFN ing a circular guiding surface engaged by o I said revoluble leg, ascrew' for' clamping Wltnes'sesz' said, member on said non-revolving legin v JOHN A. MATHEWS,

diflerent positions, and spring means for JULIA B. GENN.

